Ain't no party like an Office Christmas Party, because an Office Christmas Party gets raunchy, as ET found out on the movie's set!

The star-studded comedy features Horrible Bosses alums Jennifer Aniston and Jason Bateman along with Kate McKinnon, Olivia Munn, T.J. Miller, Vanessa Bayer, Courtney B. Vance, Rob Corddry and Sam Richardson -- all of whom are sure to be on Santa's naughty list this year for their on-screen shenanigans.

"Everything that you would hope to have at a Christmas party happens at this Christmas party," Munn tells ET's Cameron Mathison. "And everything that you hope wouldn't happen also happens at this Christmas party."

In the movie, when a CEO (Aniston) tries to close the branch run by her hard-partying brother (Miller), he and his Chief Technical Officer (Bateman) rally their co-workers and host an epic office Christmas party in an effort to impress a potential client who could save their jobs.

While the purpose of the shindig is to keep the branch afloat, everyone uses the party to serve their own personal goals. Richardson is a guy from legal, itching to show off his skills as a DJ, Bayer is an executive assistant looking for love, and McKinnon needs to satiate her obsession with the holidays.

Bateman listed just a few of the outrageous hijinks the cast of characters commits to in the movie.

"People play with the microwave, put things in it they shouldn't," Bateman says. "They play with the 3D printer."

Of course, any partygoer knows libations are the cornerstone of any respectable holiday party, and Munn gave ET a short tour of the set, showing off some of the key props used in the film.

"This is our souped-up version of Sparkletts," Munn reveals, standing in front of a bevy of beverages. "We got tequila, gin, vodka."

And while this marks Munn's first time on-screen with Aniston, she shares a previous connection with the Golden Globe winner.

Before Aniston married Justin Theroux in Bel-Air last year, The Leftovers star was giving dating tips to Munn in New York. The two were drinking buddies when Munn worked as a correspondent on The Daily Show in 2010.

"He'd be like, 'This guy. Stay away from that guy,'" recalls Munn, who is currently dating Green Bay Packers quarterback Aaron Rodgers. "He does like Aaron."

In the movie, Aniston's character isn't nearly as chummy.

"I'm sort of, in a way, the Grinch, who wants to steal Christmas away from all of these hard-working employees who are not doing as good of a job as they should be doing," Aniston says in a behind-the-scenes clip. "I know that I'm actually right. I just don't go about it the right way."